the sum of series `1+1/6+1/18+7/324 .......` infinity

The sum of series 1/2! + 1/4! + 1/6! + …….. is

The sum of the series 1+(1)/(6)+(1)/(18)+(1)/(324)+......oo, is

Find the sum of the series to n terms and to infinity : (1)/(1.3)+ (1)/(3.5) +(1)/(5.7) +(1)/(7.9)+...

Find the sum of the series 1/1.3+2/(1.3.5)+3/(1.3.5.7) ...upto infinity

The sum to infinity of the series 1/2.4+1/4.6+1/6.8+1/8.10+....... is

Find the sum of the series 1+4x+ 7x^(2)+ ... to n terms . Hence write down the sum to infinity when x lt 1 numerically .

The sum of series (1)/(2!)+(1)/(4!)+(1)/(6!)+... is

the sum of the series (1)/(2!)-(1)/(3!)+(1)/(4!)- upto infinity is

The sum of the series 1/(2!) - 1/(3!) + 1/(4!) - …….. upto infinity is